BWhy does "gravity" need to be unified?

... GR predicts that the matter inside a black hole falls into a region with zero radius and infinite density, which is non-physical...

Strictly speaking it doesn't predict that. For example what do you mean by zero radius? I am guessing that you have in mind ##r=0##, where ##r## is the usual coordinate. But this coordinate cannot, even if you stretch the meaning, be interpreted as a radius. It is not even spacelike, it is timelike. Any statement about zero radius is at the very least inaccurate and misleading.

Can you briefly, perhaps with a simple reference, provide your understanding of the difference between the two terms "gravitational wave" and "gravity wave". It is seems the two are clearly defined differently. I'd appreciate an understanding of that difference if you have the time.

Staff: Mentor

Can you briefly, perhaps with a simple reference, provide your understanding of the difference between the two terms "gravitational wave" and "gravity wave". It is seems the two are clearly defined differently. I'd appreciate an understanding of that difference if you have the time.

- As far as looking to gravity as a force ; nature may respond to us with 'guys : why do you insist on calling everything a force' ?
Of course it can't be 'denied' but it is 'human-centric' and lays deeply within us and comes from our experience on which we
interact with the world. And that is ofter forgotten, when making all those complex theories , trying to integrate gravity with everything else...